Generalist niche, specialist strategy: the diet of an Australian percichthyid

$48.00 plus tax (Refund Policy)

Download / Buy Article:

Abstract:

Dietary analysis revealed that an impoundment population of Australian bass Macquaria novemaculeata holds a generalist niche, but one arising from persistent individual specialization and interindividual variation. This ‘individual specialist' strategy appeared adaptive, but the strength of individual specialization was largely independent of variation in diet composition, except during blooms of Daphnia sp. Diet composition and dietary overlap showed only moderate ontogenetic variation, and niche breadth showed no relationship with ontogeny. Macquaria novemaculeata showed an asymmetric predator and prey size distribution, consistent with many aquatic predators, with positive relationships between fish size and average, maximum and minimum prey size. There was no asymmetry in the relative size-based niche breadths of individuals, however, which indicates that the niche is a fixed ‘window’ of relative prey sizes. The difference in the dietary niche and prey-size relationships of M. novemaculeata at the population and individual levels highlights the necessity of assessing the niche at both these levels.

Keywords: Macquaria novemaculeata; interindividual variation; ontogeny; predation

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1111/j.1095-8649.2011.02926.x

Affiliations: Fisheries and Ecosystems Research, Narrandera Fisheries Centre, NSW Department of Industry and Investment, Buckingbong Road, Narrandera, New South Wales 2700, Australia

Publication date: April 1, 2011

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more